#VU33819 Input validation error in Kerberos 5 - CVE-2015-2696

Vulnerability identifier: #VU33819

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2015-2696

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Kerberos 5
Client/Desktop applications / Software for system administration

Vendor: MIT

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

lib/gssapi/krb5/iakerb.c in MIT Kerberos 5 (aka krb5) before 1.14 relies on an inappropriate context handle, which allows remote attackers to cause a denial of service (incorrect pointer read and process crash) via a crafted IAKERB packet that is mishandled during a gss_inquire_context call.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kerberos 5: 1.0 - 1.18.2

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External links
https://krbdev.mit.edu/rt/Ticket/Display.html?id=8244
https://lists.opensuse.org/opensuse-security-announce/2015-11/msg00006.html
https://lists.opensuse.org/opensuse-security-announce/2015-11/msg00014.html
https://lists.opensuse.org/opensuse-security-announce/2015-11/msg00022.html
https://www.debian.org/security/2015/dsa-3395
https://www.securityfocus.com/bid/90675
https://www.securitytracker.com/id/1034084
https://www.ubuntu.com/usn/USN-2810-1
https://github.com/krb5/krb5/commit/e04f0283516e80d2f93366e0d479d13c9b5c8c2a
https://security.gentoo.org/glsa/201611-14

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.